http://www.bacto.com.au/glass-conical-joint-sizes/
Looking at 24/29 size: 24.0 - 21.1 = 2.9mm diameter difference over a distance of 29mm
The tangent would be 2.9/2 divided by 29 = 0.05
Arctan of 0.05 = 2.862 degrees
[I think--but I haven't been in a machine shop for twenty years]
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